Poet::Log(3pm) | User Contributed Perl Documentation | Poet::Log(3pm) |
Poet::Log -- Poet logging
# In a conf file... log: defaults: level: info output: poet.log layout: "%d{dd/MMM/yyyy:HH:mm:ss.SS} [%p] %c - %m - %F:%L - %P%n" class: CHI: level: debug output: chi.log layout: "%d{dd/MMM/yyyy:HH:mm:ss.SS} %m - %P%n" MyApp::Foo: output: stdout # In a script... use Poet::Script qw($log); # In a module... use Poet qw($log); # In a component... my $log = $m->log; # For an arbitrary category... my $log = Poet::Log->get_logger(category => 'MyApp::Bar'); # then... $log->error("an error occurred"); $log->debugf("arguments are: %s", \@_) if $log->is_debug();
Poet uses Log::Any and Log::Log4perl for logging, with simplified configuration for the common case.
Log::Any is a logging abstraction that allows CPAN modules to log without knowing about which logging framework is in use. It supports standard logging methods ("$log->debug", "$log->is_debug") along with sprintf variants ("$log->debugf").
Log4perl is a powerful logging package that provides just about any logging-related feature you'd want. One of its only drawbacks is its somewhat cumbersome configuration. So, we provide a way to configure Log4perl simply through Poet configuration if you just want common features.
Note: Log4perl is not a strict dependency for Poet. Log messages will simply not get logged until you install it or until you modify logging for your app.
The configurations below can go in any Poet conf file, e.g. "local.cfg" or "global/log.cfg".
Here's a simple configuration that caches everything to "logs/poet.log" at "info" level. This is also the default if no configuration is present.
log: defaults: level: info output: poet.log layout: %d{dd/MMM/yyyy:HH:mm:ss.SS} [%p] %c - %m - %F:%L - %P%n
Here's a more involved configuration that maintains the same default, but adds several categories that are logged differently:
log: defaults: level: info output: poet.log layout: "%d{dd/MMM/yyyy:HH:mm:ss.SS} [%p] %c - %m - %F:%L - %P%n" category: CHI: level: debug output: chi.log layout: "%d{dd/MMM/yyyy:HH:mm:ss.SS} %m - %P%n" MyApp::Foo: output: stdout
For the default and for each category, you can specify three different settings:
If a setting isn't defined for a specific category then it falls back to the default. In this example, "MyApp::Foo" will inherit the default level and layout.
Notice that we use '::' instead of '.' to specify hierarchical category names, because '.' would interfere with Poet::Conf dot notation.
Finally, if you must use a full Log4perl configuration file, you can specify it this way:
log: log4perl_conf: /path/to/log4perl.conf
use Poet::Script qw($log);
use Poet qw($log);
my $log = $m->log;
my $log = Poet::Log->get_logger(category => 'Some::Category'); # or my $log = MyApp::Log->get_logger(category => 'Some::Category');
$log->error("an error occurred"); $log->debugf("arguments are: %s", \@_) if $log->is_debug();
See "Log::Any|Log::Any" for more details.
These methods are not intended to be called externally, but may be useful to override or modify with method modifiers in subclasses. Their APIs will be kept as stable as possible.
Poet
Jonathan Swartz <swartz@pobox.com>
This software is copyright (c) 2012 by Jonathan Swartz.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
2015-01-08 | perl v5.20.2 |